solving the fastening of a 3-level stacking: Raspberry Pi 3 model B+ in the middle, 7-inch screen below and StromPi v2 UPS above.

thread is M2,5. initially:

• screen is attached to RPI with "spacer screws" (12 mm + male threaded end 3 mm)
• UPS is attached to RPI with screw (12 mm) with tubular spacers (7 mm).

in this case, we are looking for:

• long screws and tubular spacers.
  • screw length 15 + 12 = 27 mm ideally, we take 30 mm (standard, threads on the screen can absorb an additional 3 mm)
  • additional set of tubular spacers: length 12 mm, plastic (?) tubing 5 x 1 mm
• or "spacer screws" (ideally 7 mm) with long (4 mm instead of 3 mm) male threaded ends

M2,5 x 30 mm screws

• conrad, 200 pces/25 CHF
• reichelt 200 pces/2.76 CHF
• tme.eu et distrelec.ch: rien

tubular spacers 5 x 1 x 12 mm

• reichelt:
  • plastique 0.30 CHF/10 pces
  • laiton zingué 1.60 CHF/10 pces
• TME 6 EUR/100 pces
• distrelec, un peu trop large mais OK 8.50 CHF/50 pces
• conrad rien

• TME 8 EUR/100 pces ou 1 EUR/10 pces
• distrelec 77 CHF/50 pces ou 7 CHF/4 pces
• conrad rien